Porsche Enthusiasts Club Forum

Waylander wrote:30lb/ft is not much, bet they have been over tightened in the past,

I put new 12.4 high tensile bolts in mine bought pack of 40 off Kay’s Fasteners on eBay M6 x 80mm Allen heads, about £8 I think

I will update the sheet on the website

Yes, that's what I thought; but why would new 8.8 bolts snap as well!?

Hopefully will get some 12.4 & try them.

Will try to keep you updated if the new ABS sensors are fully functional in place.

Unfortunately, the new ABS sensors have not cured my problem!

are you sure it was a rear,

if it only comes on once you go over 5kph can you hear the motor prime in the OS / RH wheel arch

Waylander wrote:are you sure it was a rear,

if it only comes on once you go over 5kph can you hear the motor prime in the OS / RH wheel arch

Not entirely sure it was the rear. But the front ones had a close reading to each other. The rear driver's side had an erratic reading & rear passenger side was fitted in place & did not seem like a perfect fit as well as a not so accurate part number; 0 265 001

Waylander wrote:are you sure it was a rear,

if it only comes on once you go over 5kph can you hear the motor prime in the OS / RH wheel arch

How can I hear the ABS pump prime? Yes, it does come on after 5Kph.

You should hear a little buzz as the ABS motor primes, if you can’t hear that and the light comes on when it should have primed, try unplugging the abs relay then lug it back in and try it again

Waylander wrote:You should hear a little buzz as the ABS motor primes, if you can’t hear that and the light comes on when it should have primed, try unplugging the abs relay then lug it back in and try it again

Cheers, will give it a go tomorrow.

Tried the relay but could not here anything from the ABS pump, although a bit noisy here.

Took out the relay & started up the car, fault came on immediately & not after 5kph; so assume the relay is functioning!?

Would seem to be, think you need test all the connections from wheel to ecu and make sure the motor runs
As there are two relays on top of the pump that need checking and cleaning

Waylander wrote:Would seem to be, think you need test all the connections from wheel to ecu and make sure the motor runs
As there are two relays on top of the pump that need checking and cleaning

Ok, will take it back to the shop after the holidays & take off wheel liner so to have a look at the relays/motor.

Do you have a link to which pins at the ECU relate to which wires at the wheels?

Also, would you know how to run the ABS motor without having to drive the car to 5Kph & trying to listen for it to prime? This would be safer & maybe can be done whilst working at the ECU or pump?

You can test the motor runs with connecting a + jump lead to the big red lead on the rear of the motor

I don’t know any other way of testing it

The relays on the motor are live all the time

I have a pin out somewhere for the 968 I will find it tomorrow

Waylander wrote:You can test the motor runs with connecting a + jump lead to the big red lead on the rear of the motor

I don’t know any other way of testing it

The relays on the motor are live all the time

I have a pin out somewhere for the 968 I will find it tomorrow

Found the pin out in one of you other posts & thought I should try continuity testing before going at the ABS pump.

Tested & found good continuity from ECU to sensors. While doing so, found that front sensors(that were on the car) read 1043 milli ohms & rear(new ones fitted) read 1697 milli ohms. Also, couldn't really read accurate Voltage while rotating wheel steadily; but could get a reading by just rotating very slowly Any how, front were .001V & reaR .004

Will still have a look at the ABS pump.

Any thoughts?

got to have the meter on AC,

you should get about .5v from them all, resistance is not that bad and they are not open circuit so further investigation is required

ABS Sorted!

So, dived into the ABS pump & for some reason, the harness sheathing had split & two wires were damaged. One wire just was chafed, the other completely separated into two with strands hanging out. After some acrobatics, managed to get the main plug off the motor assembly & pulled the harness back inside the kick panel for repair.

Had a few runs with the car today; no ABS warnings. With all new brakes settling in & ABS issue resolved, could enjoy the braking system, although still not at high speed yet.

Waylander, this should confirm those rear ABS sensors are a cheaper replacement & may help others.

That is just great news it’s all sorted, now to test the abs actually works

Some loose surface or wet or grass, 20mph and hit the brakes see what happens